A LARGE-SCALE THREE-DIMENSIONAL SEISMIC STRUCTURE UNDER THE JAPAN ISLANDS AND THE SEA OF JAPAN
A LARGE-SCALE THREE-DIMENSIONAL SEISMIC STRUCTURE UNDER THE JAPAN ISLANDS AND THE SEA OF JAPAN
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日本列岛和日本海下的大型三维地震构造
DOI：
10.4294/jpe1952.25.393
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
K. Hirahara
中科院分区：
文献类型：
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作者：
K. Hirahara
应用阿基等人的反演方法，研究了日本列岛和日本海下至650 km的大尺度三维地震速度结构，以阐明岩石圈板块的俯冲作用。利用日本及国外330个台站的20次中深源地震的P波走时残差资料，对多个块体的速度异常进行了测定，并同时进行了震源校正。这一分析很好地揭示了450 km以上上地幔的横向不均匀性。一个对应于太平洋板块下降的高速带已经被清楚地识别出来，特别是在本州弧北部，这表明与周围一些地震的水平和垂直分布有很好的相关性。发现中深源地震主要发生在厚度约100公里的下降板块的上部。在板块内部，最大速度异常为+5-6%（50- 250 km），+3%（350 km），+2%（450 km），在下降板块的大陆一侧，最大速度异常为-2%（350 km）。
A large-scale three-dimensional seismic velocity structure down to 650 km under the Japan Islands and the Sea of Japan has been investigated to clarify the subduction of lithospheric plates by applying the inversion method of Aki and others. About 3500 data of P-wave travel time residuals observed at 330 Japanese and foreign stations from 20 intermediate and deep-focus earthquakes around Japan were used to determine the velocity anomalies in a number of blocks and source corrections simultaneously. This analysis has well revealed lateral heterogeneities in the upper mantle above 450km. A high velocity zone corresponding to the descending Pacific plate has been clearly identified, particularly in the north Honshu arc, indicating good correlations with the horizontal and vertical distributions of a number of earthquakes around there. It was found that intermediate and deep-focus earthquakes take place mainly in the upper portions of the descending plate with a thickness of about 100km. The highest velocity anomalies are +5-6%(50-250km), +3%(350km), +2%(450km) within the plate, and about -2% down to 350km over a region on the continental side of the descending plate.
影响因子：
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作者：
K. Aki;A. Christoffersson;E. Husebye
通讯作者：
K. Aki;A. Christoffersson;E. Husebye